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Search: id:A015053
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| A015053 |
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Smallest positive integer for which n divides a(n)^6. |
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+0
4
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| 1, 2, 3, 2, 5, 6, 7, 2, 3, 10, 11, 6, 13, 14, 15, 2, 17, 6, 19, 10, 21, 22, 23, 6, 5, 26, 3, 14, 29, 30, 31, 2, 33, 34, 35, 6, 37, 38, 39, 10, 41, 42, 43, 22, 15, 46, 47, 6, 7, 10, 51, 26, 53, 6, 55, 14, 57, 58, 59, 30, 61, 62, 21, 2, 65, 66, 67, 34, 69, 70, 71, 6, 73, 74, 15, 38, 77, 78
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Multiplicative with a(p^e) = p^(ceiling(k/5)). Christian G. Bower (bowerc(AT)usa.net) May 16, 2005.
Differs from A007947 as follows: A007947(128)=2, a(128)=4; A007947(256)=2, a(256)=4; A007947(384)=6, a(384)=12; A007947(512)=2, a(512)=4; A007947(640)=10, a(640)=20, etc. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 28 2008]
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LINKS
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H. Ibstedt, Surfing on the Ocean of Numbers, Erhus Univ. Press, Vail, 1997.
M. L. Perez et al., eds., Smarandache Notions Journal
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CROSSREFS
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Cf. A019554, A019555, A015052.
Sequence in context: A056554 A088835 A007947 this_sequence A062953 A015052 A053166
Adjacent sequences: A015050 A015051 A015052 this_sequence A015054 A015055 A015056
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KEYWORD
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nonn,mult
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AUTHOR
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R. Muller (Research37(AT)aol.com)
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EXTENSIONS
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Corrected by David W. Wilson, Jun 04, 2002.
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